The IM_DRAWFRAME method instructs the image to render itself within the
confines of the given rectangle.  It receives the following parameters:

    struct impDraw
    {
        ULONG MethodID;
        struct RastPort *imp_RPort;
        struct
        {
            WORD X;
            WORD Y;
        } imp_Offset;

        ULONG imp_State;
        struct DrawInfo *imp_DrInfo;

        struct
        {
            WORD Width;
            WORD Height;
        } imp_Dimensions;
    };

The Width and Height fields provide the object's rectangular bounds. How
the image object deals with the frame is implementation specific.
Typically, a scaleable image will scale itself as best it can to fit into
the rectangle.  The mytextlabelclass.c example does not actually implement
this method, instead mytextlabelclass treats IM_DRAWFRAME like the IM_DRAW
method.

In general, applications that use this method to draw an object should use
the IM_ERASEFRAME method (see below) to erase it.  This will ensure that
the image was erased at the proper scale.

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